On 2/27/2010 9:48 PM Michael Shell spake thus:

On Sat, 27 Feb 2010 20:25:26 -0800
David Nebenzahl wrote:

Well, I tried cleaning the dust out of my Dell-branded Trinitron tube.
In so doing I seem to have knocked the convergence out of whack, even
though I was really careful vacuuming around the CRT.

There's an on-screen convergence control, but even with it cranked all
the way over (to 100/100 for the horizontal control, 76 for the
vertical), there are still highly visible "ghosts" on screen.

Try demagnetizing it first, especially if your monitor has a built-in
degaussing button. The next step is to degauss with an external
demagnitizer. There are TV degaussing coils for this (check Ebay), but
you might be able to make do with something like a bulk tape eraser
if you already have one.

No bulk eraser, but I do have a couple of tape head demagnetizers;
wonder if they'd do any good. But the monitor has a built-in degausser
anyhow.

Color convergence problems will show up as red, blue or green outlines
and/or duplicate images - like when the colors don't align on newspaper
comic sections. If the ghosts you see are not in different colors,
then it is not a convergence problem. The focus control is often very
easy to unintentionally turn although a misadjusted focus control
generally causes blurriness rather than ghosts.

It's definitely a convergence problem. I can see the colors shifting
when I adjust the on-screen convergence control, but not far enough to
eliminate the ghosts (which are definitely in different colors). The
focus is fine.


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